RelationIndexManager Class Reference

Manager to keep a cache of existing RelationIndexContainers. More...

#include <RelationIndexManager.h>

Public Member Functions
template<class FROM , class TO >
std::shared_ptr< RelationIndexContainer< FROM, TO > >	get (const RelationArray &relation)
	Get a RelationIndexContainer.
void	clear (DataStore::EDurability durability=DataStore::c_Event)
	Clear the cache of RelationIndexContainers with the given durability.
void	reset ()
	Reset the cache completely, that is clear all caches and don't even keep the Index objects around.

Static Public Member Functions
static RelationIndexManager &	Instance ()
	Returns the singleton instance.

Protected Types
typedef std::map< std::string, std::shared_ptr< RelationIndexBase > >	RelationMap
	Maptype to keep track of all Containers of one durability.
typedef std::array< RelationMap, DataStore::c_NDurabilityTypes >	RelationCache
	Cachetype for all Containers.

Protected Member Functions
	RelationIndexManager ()=default
	No Constructor hidden.
	RelationIndexManager (const RelationIndexManager &)=delete
	No copy-constructor.
	RelationIndexManager (RelationIndexManager &&)=delete
	No move constructor.
RelationIndexManager &	operator= (const RelationIndexManager &)=delete
	Also no assignment.
template<class FROM , class TO >
std::shared_ptr< RelationIndexContainer< FROM, TO > >	getIndexIfExists (const std::string &name, DataStore::EDurability durability) const
	if the index exists in the cache, it is returned; otherwise NULL.
	~RelationIndexManager ()
	Clean cache on exit.

Protected Attributes
RelationCache	m_cache
	Cache for all Containers.

Friends
class	DataStore
	only DataStore should be able to get non-const indices.

Detailed Description

Manager to keep a cache of existing RelationIndexContainers.

This singleton keeps track of all RelationIndexContainers that where created to make sure indices are not created more often than needed.

This class is only used internally, users should use RelationsObject/RelationsInterface to access/add relations.

Definition at line 30 of file RelationIndexManager.h.

Member Typedef Documentation

RelationCache

typedef std::array<RelationMap, DataStore::c_NDurabilityTypes> RelationCache

protected

Cachetype for all Containers.

Definition at line 122 of file RelationIndexManager.h.

RelationMap

typedef std::map<std::string, std::shared_ptr<RelationIndexBase> > RelationMap

protected

Maptype to keep track of all Containers of one durability.

Definition at line 120 of file RelationIndexManager.h.

Constructor & Destructor Documentation

~RelationIndexManager()

~RelationIndexManager ( )

inlineprotected

Clean cache on exit.

Definition at line 114 of file RelationIndexManager.h.

    {
      reset();
    }

Member Function Documentation

clear()

void clear

(

DataStore::EDurability

durability = DataStore::c_Event

)

Clear the cache of RelationIndexContainers with the given durability.

Parameters

durability

Which cache to clear

Definition at line 18 of file RelationIndexManager.cc.

{
  RelationMap& relations = m_cache[durability];
  for (auto& e : relations) {
    if (e.second) e.second->clear();
  }
}

get()

std::shared_ptr< RelationIndexContainer< FROM, TO > > get ( const RelationArray &  relation )

inline

Get a RelationIndexContainer.

Return a const reference to a RelationIndexContainer for the given name and durability. If none exists it will be created. If it already exists we rebuild the index if the underlying RelationArray has changed in the meantime

Parameters

relation

Relation to build an index for

Returns

A RelationIndexContainer

Definition at line 45 of file RelationIndexManager.h.

    {
      const static bool doTypeCheck = (FROM::Class() != TObject::Class() or TO::Class() != TObject::Class());
      if (doTypeCheck)
        relation.isValid();
 
      const std::string& name = relation.getName();
      DataStore::EDurability durability = relation.getDurability();
      RelationMap& relations =  m_cache[durability];
      std::shared_ptr<RelationIndexContainer<FROM, TO>> indexContainer;
      RelationMap::iterator it = relations.find(name);
      if (it != relations.end()) {
        //if existing array is of wrong type, we'll overwrite the shared_ptr here, but the index will live on with any RelationIndex objects that use it.
        indexContainer = std::dynamic_pointer_cast<RelationIndexContainer<FROM, TO>>(it->second);
      }
      if (!indexContainer) {
        indexContainer.reset(new RelationIndexContainer<FROM, TO>(relation));
        relations[name] = indexContainer;
      } else {
        indexContainer->rebuild(false);
      }
      return indexContainer;
    }

getIndexIfExists()

std::shared_ptr< RelationIndexContainer< FROM, TO > > getIndexIfExists ( const std::string &  name, DataStore::EDurability  durability  ) const

inlineprotected

if the index exists in the cache, it is returned; otherwise NULL.

The index is not rebuilt, which makes this mostly useful to do minor changes to the index in DataStore::addRelation().

Definition at line 101 of file RelationIndexManager.h.

    {
      const RelationMap& relations =  m_cache[durability];
      RelationMap::const_iterator it = relations.find(name);
      if (it != relations.end()) {
        return std::dynamic_pointer_cast<RelationIndexContainer<FROM, TO>>(it->second);
      } else {
        return nullptr;
      }
    }

Instance()

RelationIndexManager & Instance ( )

static

Returns the singleton instance.

Definition at line 13 of file RelationIndexManager.cc.

{
  static RelationIndexManager instance;
  return instance;
}

reset()

void reset ( )

inline

Reset the cache completely, that is clear all caches and don't even keep the Index objects around.

Needed when the DataStore is reset to make sure we don't have dangling pointer into the previous DataStore contents.

Definition at line 81 of file RelationIndexManager.h.

    {
      for (int i = 0; i < DataStore::c_NDurabilityTypes; i++)
        m_cache[i].clear();
    }

Friends And Related Function Documentation

DataStore

friend class DataStore

friend

only DataStore should be able to get non-const indices.

Definition at line 127 of file RelationIndexManager.h.

Member Data Documentation

m_cache

RelationCache m_cache

protected

Cache for all Containers.

Definition at line 124 of file RelationIndexManager.h.

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The documentation for this class was generated from the following files:

• framework/datastore/include/RelationIndexManager.h
• framework/datastore/src/RelationIndexManager.cc